A broad area of low pressure that moved westward from a tropical wave developed a defined center and became a tropical depression about 700 nautical miles southwest of the southern tip of the Baja California peninsula at 1200 UTC on 25 September 2016. The system strengthened into Tropical Storm Roslyn at 0000 UTC 26 September, moved generally north to northeast under the influence of a nearby upper-level low, weakened beginning 27 September, became a depression by 0000 UTC 29 September, and lost tropical characteristics later that day. The remnant low moved westward and dissipated a few hundred nautical miles west of Cabo San Lázaro shortly after 1800 UTC 30 September.
Roslyn did not make landfall. It remained well offshore of Mexico throughout its life, and no coastal watches or warnings were issued.
The storm’s peak intensity was 45 knots (about 52 mph) with a minimum central pressure of 999 mb, reached around 1800 UTC 26 September. At peak it was a moderate tropical storm and never reached hurricane strength.
Because Roslyn stayed at sea, there were no reports of storm surge or rainfall impacts on land in the NHC report and no measurements of coastal surge tied to the cyclone. There were also no ship reports of tropical-storm-force winds associated with Roslyn.
There were no reported deaths or damage related to Roslyn. The most affected area was open ocean; no coastal impacts were recorded.
Forecast notes: NHC genesis forecasts initially expected development well in advance and were somewhat aggressive at longer lead times, while official track errors were larger than recent 5-year averages. Official intensity forecasts performed reasonably well and correctly anticipated that Roslyn would not strengthen significantly.
Paid members can generate summaries tailored to the counties of their choice. The Roslyn TCR covers impacts across many counties and states — a Pinellas County resident doesn't need the Asheville detail, and a Buncombe County resident doesn't need the Tampa surge data.
Upgrade for county-specific summariesSummary above produced from the National Hurricane Center's official post-storm Tropical Cyclone Report. Read the full report for casualty lists, damage estimates by area, forecast critique, and detailed meteorological discussion:
📄 Read NHC's full report on Roslyn → (opens at nhc.noaa.gov)| Time (UTC) | Status | Lat | Lon | Winds (kt) | Pressure (mb) | Record |
|---|---|---|---|---|---|---|
| 2016-09-25 12:00 | TD | 15.30 | -119.70 | 30 | 1006 | |
| 2016-09-25 18:00 | TD | 15.80 | -119.70 | 30 | 1005 | |
| 2016-09-26 00:00 | TS | 16.20 | -119.70 | 35 | 1005 | |
| 2016-09-26 06:00 | TS | 16.50 | -119.60 | 40 | 1003 | |
| 2016-09-26 12:00 | TS | 16.70 | -119.40 | 45 | 999 | |
| 2016-09-26 18:00 | TS | 16.80 | -119.00 | 45 | 999 | |
| 2016-09-27 00:00 | TS | 17.00 | -118.60 | 45 | 999 | |
| 2016-09-27 06:00 | TS | 17.50 | -118.10 | 40 | 1003 | |
| 2016-09-27 12:00 | TS | 18.00 | -117.50 | 40 | 1003 | |
| 2016-09-27 18:00 | TS | 18.50 | -116.80 | 40 | 1003 | |
| 2016-09-28 00:00 | TS | 19.20 | -116.10 | 35 | 1004 | |
| 2016-09-28 06:00 | TS | 20.00 | -115.50 | 35 | 1005 | |
| 2016-09-28 12:00 | TS | 20.70 | -115.20 | 35 | 1006 | |
| 2016-09-28 18:00 | TS | 21.30 | -115.10 | 35 | 1007 | |
| 2016-09-29 00:00 | TD | 21.80 | -115.10 | 30 | 1007 | |
| 2016-09-29 06:00 | TD | 22.50 | -115.20 | 25 | 1008 | |
| 2016-09-29 12:00 | LO | 23.20 | -115.40 | 25 | 1010 | |
| 2016-09-29 18:00 | LO | 23.80 | -115.70 | 20 | 1012 | |
| 2016-09-30 00:00 | LO | 24.20 | -116.00 | 15 | 1012 | |
| 2016-09-30 06:00 | LO | 24.40 | -116.50 | 15 | 1014 | |
| 2016-09-30 12:00 | LO | 24.30 | -116.90 | 15 | 1014 | |
| 2016-09-30 18:00 | LO | 24.00 | -117.20 | 15 | 1014 |
Source: NOAA National Hurricane Center HURDAT2 best-track database (nhc.noaa.gov/data). Data is in the public domain. Best-track positions and intensities are post-storm reanalysis estimates and may differ from real-time advisories.